02-22-10, 03:54 PM
Hello all and thank you in Advance For your help Guys. I have a 2000 deville base model with 104000 miles runs like a dream. I. Purchasedthe car 8months Ago and always Read check cooant level when Car Was Turned on, when I hit info Reset It would not Come back only when engine is restarted. One day I decide to top off Coolant with 50/50 dex cool and from than on. Here and there maybe after 40 minutes of city or highway driving, engine temp goes up slowly until "engine hot-ac off" message Appears. I pull over for about 5 minutes and The temp goes back To the half Way mark this has been going on for 3 weeks now. I saw the coolant. Tank was very dirty and the water was very brown with deris in The tank, I got a coolant flush yesterday and took it out on da road and the flush improved the performance right a way. Should I worry about my gaskets if engine still overheats??? Also Recently (winter NJ) I've noticed a little bit of white smoke coming out of muffler a little more than every one elses car. Smoke smells a little gassy, and I'm only grtting 12mpg . I drive 80% city. How can I improve gas Mileage???? Thanks again guys.